`parent_lookup_kwargs` raises an attribute error in django-spectacular api docs.

[73VW]

Hello there,

I am using DRF 3.14, drf-spectacular 0.26.3 and drf-nested-routers 0.93.4.

I have tried to use the NestedViewSetMixin the following:

class PlaylistViewSet(ModelViewSet):
    permission_classes = [IsAuthenticatedOrReadOnly]
    queryset = Playlist.objects
    serializer_class = PlaylistSerializer

class PlaylistTrackListViewSet(NestedViewSetMixin, ModelViewSet):
    permission_classes = [IsAuthenticatedOrReadOnly]
    queryset = PlaylistTrackRel.objects
    serializer_class = PlaylistTrackRelSerializer
    parent_lookup_kwargs = {
        "playlist_pk": "playlist__pk",
    }

When generating the doc with django spectactular, I get the following error:

KeyError at /api/v1/schema/
'playlist_pk'

Traceback (most recent call last):
  File "/var/www/app/.venv/lib/python3.11/site-packages/django/core/handlers/exception.py", line 55, in inner
    response = get_response(request)
               ^^^^^^^^^^^^^^^^^^^^^
  File "/var/www/app/.venv/lib/python3.11/site-packages/django/core/handlers/base.py", line 197, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/www/app/.venv/lib/python3.11/site-packages/django/views/decorators/csrf.py", line 56, in wrapper_view
    return view_func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/www/app/.venv/lib/python3.11/site-packages/django/views/generic/base.py", line 104, in view
    return self.dispatch(request, *args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/www/app/.venv/lib/python3.11/site-packages/rest_framework/views.py", line 509, in dispatch
    response = self.handle_exception(exc)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/www/app/.venv/lib/python3.11/site-packages/rest_framework/views.py", line 469, in handle_exception
    self.raise_uncaught_exception(exc)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/www/app/.venv/lib/python3.11/site-packages/rest_framework/views.py", line 480, in raise_uncaught_exception
    raise exc
    ^^^^^^^^^
  File "/var/www/app/.venv/lib/python3.11/site-packages/rest_framework/views.py", line 506, in dispatch
    response = handler(request, *args, **kwargs)
               ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/www/app/.venv/lib/python3.11/site-packages/drf_spectacular/views.py", line 83, in get
    return self._get_schema_response(request)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/www/app/.venv/lib/python3.11/site-packages/drf_spectacular/views.py", line 91, in _get_schema_response
    data=generator.get_schema(request=request, public=self.serve_public),
         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/www/app/.venv/lib/python3.11/site-packages/drf_spectacular/generators.py", line 268, in get_schema
    paths=self.parse(request, public),
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/www/app/.venv/lib/python3.11/site-packages/drf_spectacular/generators.py", line 212, in parse
    view.request = spectacular_settings.GET_MOCK_REQUEST(method, path, view, input_request)
                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/www/app/.venv/lib/python3.11/site-packages/drf_spectacular/plumbing.py", line 1167, in build_mock_request
    request = view.initialize_request(request)
              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/var/www/app/.venv/lib/python3.11/site-packages/rest_framework_nested/viewsets.py", line 72, in initialize_request
    querydict[parent_arg] = kwargs[url_kwarg]
                            ^^^^^^^^^^^^^^^^^

Exception Type: KeyError at /api/v1/schema/
Exception Value: 'playlist_pk'

I have tried to change initialize_request based on what's done in get_queryset in viewsets.py:

    def initialize_request(self, request, *args, **kwargs):
        """
        Adds the parent params from URL inside the children data available
        """
        request = super().initialize_request(request, *args, **kwargs)

        if getattr(self, 'swagger_fake_view', False):
            return request
        for url_kwarg, fk_filter in self._get_parent_lookup_kwargs().items():
            # fk_filter is alike 'grandparent__parent__pk'
            parent_arg = fk_filter.partition('__')[0]
            for querydict in [request.data, request.query_params]:
                with _force_mutable(querydict):
                    querydict[parent_arg] = kwargs[url_kwarg]
        return request

This seem to fix the problem.

Should I open a PR to fix this?

Thanks in advance

[73VW]

Has it been fixed in the meantime? My PR doesn't seem to add much now

[73VW]

Seems to have been merged already in another MR: https://github.com/alanjds/drf-nested-routers/pull/312#issuecomment-1799908047